I've heard great things about the Littmann cardiology scopes, but alot of RNs in the ED I work in have Ultrascopes and love them!!! They swear by them...I was curious so I borrowed one from one nurse and took a listen---amazing. I have a slight hearing problem and lots of scopes are difficult for me to hear anything, but that Ultrascope was as clear as a bell! Doesn't hurt also that they look cute and funky!